Vegetative growth and essential oil productivity of lemongrass (Cymbopogon citratus) as affected by NPK and some growth stimulators
El-Mahrouk EM, AI Abido, FI Radwan, ES Hamed, EE El-Nagar
Split plot field experiments were conducted at Khamisa village, Siwa Oasis during 2016 and 2017 seasons to study the effect of NPK doses (main plot) and spraying with some growth stimulators (control, and extracts of compost tea, Spirulina platensis algae and lithovit) as sub plot on vegetative growth traits and essential oil productivity of lemongrass. The obtained results indicated that NPK full dose significantly improved vegetative growth traits and essential oil% and yield per plant and fedd. over than NPK half dose in the two cuts for both seasons. Compost tea had caused significant increases in vegetative growth traits and oil yield/ plant and fedd. in comparison of the other growth stimulators, while lithovit significantly enhanced oil% than the other growth stimulators for the two cuts in the two seasons. For the interaction between NPK doses and the growth stimulators data pointed out that NPK full dose combined with compost tea had resulted in the best values of vegetative growth traits and essential oil yield per plant and fedd. On the other side, the highest essential oil% was found in the treated plants with either NPK full dose or NPK half dose combined with lithovit for the two cuts in both seasons. Nine compounds of essential oil of lemongrass were identified. The main components were citral A (geranial), followed by citral B (neral), then D-limonene which were resulted from the plants had been received NPK dose combined with compost tea and 1/2 NPK dose combined with either algae extract or lithovit, respectively.